再生骨料透水混凝土强度及透水性能试验

发布时间：2018-07-03 11:04

本文选题：混凝土 + 性能　；参考：《农业工程学报》2017年15期

【摘要】：利用再生废弃混凝土骨料制备透水混凝土是目前研究的热点和趋势,其中强度和透水性是其关注及目前亟待突破的关键性能。以废弃的预制混凝土梁构件为再生骨料来源制备透水混凝土,并以水胶比0.3,砂率10%为基准,设计6组配合比,并通过标准养护下的立方体试块试验,研究了单一因素下再生骨料透水混凝土的孔隙率、透水性及其强度性能,其范围分别为孔隙率17.8%~23.8%,渗透系数0.27~0.57 cm/s以及抗压强度4.0~9.63 MPa。结果表明,再生骨料透水混凝土基本性能够满足要求,其中内掺粉煤灰能大幅提高其抗压强度,提高约44%,外掺钢纤维提高透水性,掺入萘系高效减水剂及硅粉的效果不明显。此外,再生骨料透水混凝土的毛细吸水过程与普通混凝土类似,即前期吸水快,后期趋于平缓。
[Abstract]:It is a hot point and trend to prepare permeable concrete with recycled waste concrete aggregate at present, among which strength and permeability are the key properties that need to be broken through. Using the abandoned precast concrete beam members as the source of recycled aggregate, the permeable concrete was prepared. Based on the water-binder ratio of 0.3 and the sand ratio of 10%, six groups of mix ratios were designed, and the cube tests were carried out under the standard curing condition. The porosity, water permeability and strength properties of recycled aggregate pervious concrete under a single factor are studied. The ranges of porosity, permeability coefficient and compressive strength are 17.8and 23.8respectively, the permeability coefficient is 0.270.57 cm/s and the compressive strength is 4.0 ~ 9.63MPa. The results show that the basic properties of recycled aggregate permeable concrete can meet the requirements, in which the compressive strength of recycled aggregate permeable concrete can be greatly increased by adding fly ash, the water permeability is improved by adding steel fiber, and the effect of adding naphthalene superplasticizer and silica fume is not obvious. In addition, the capillary absorption process of recycled aggregate permeable concrete is similar to that of ordinary concrete.
【作者单位】：华北水利水电大学水利学院;河南省水环境治理与生态修复院士工作站;
【基金】：国家自然科学青年基金项目(51309101) 国家自然科学基金面上项目(51679092)
【分类号】：TU528

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